Useful Ruby Commands

gistfile1.txt

books.valu­es.each { |rate­| ratin­gs[rate] += 1 }

class BlogEntry
  def initialize( title, mood, fulltext )
    @time = Time.now
    @title, @mood, @fulltext = title, mood, fulltext
  end
end

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http://stackoverflow.com/questions/1611237/how-to-manipulate-dom-with-ruby-on-rails

If what you're trying to do is manipulate HTML documents inside a rails application, you should take a look at Nokogiri.

It uses XPath to search through the document. With the following, you would find any h1 with the "blue" css class inside a document.

require 'nokogiri'
require 'open-uri'

doc = Nokogiri::HTML(open('http://www.stackoverflow.com'))
doc.xpath('//h1/a[@class="blue"]').each do |link|
    puts link.content
end
After, if what you were trying to do was indeed parse the current page dom, you should take a look at JavaScript and JQuery. Rails can't do that.

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require 'uri/http'

uri = URI.parse("http://toolbar.google.com")
domain = PublicSuffixList.parse(uri.host)
# => "toolbar.google.com"
domain.domain
# => "google.com"

uri = URI.parse("http://www.google.co.uk")
domain = PublicSuffixList.parse(uri.host)
# => "www.google.co.uk"
domain.domain
# => "google.com"

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http://immediatenet.com/t/fs?Size=1024x768&URL=
-----------------

require 'net/http'
Net::HTTP.start("somedomain.net/") do |http|
    resp = http.get("/flv/sample/sample.flv")
    open("sample.flv", "wb") do |file|
        file.write(resp.body)
    end
end
puts "Done."
-----------------

Edit2: The solution which saves part of a file while downloading:

# instead of http.get
f = open('sample.flv')
begin
    http.request_get('/sample.flv') do |resp|
        resp.read_body do |segment|
            f.write(segment)
        end
    end
ensure
    f.close()
end

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http://fog.io/0.8.1/storage/

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Directories
http://rubyist-journal.com/2010/05/27/the-dilemma-of-rails-root-vs-rails_root-complex/

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-bash> echo "config/app_environment_variables.rb" >> .gitignore 

config/app_environment_variables.rb

ENV['HTTP_USER'] = 'devuser'
ENV['HTTP_PASS'] = 'devpass'

As well, add the following lines to config/environment.rb, between the require line, and the Application.initialize line:

# Load the app's custom environment variables here, so that they are loaded before environments/*.rb

app_environment_variables = File.join(Rails.root, 'config', 'app_environment_variables.rb')
load(app_environment_variables) if File.exists?(app_environment_variables)

As the comment above says, by doing this you will be loading your environment variables before environments/*.rb, which means that you will be able to refer to your variables inside those files (e.g. environments/production.rb). This is a great advantage over putting your environment variables file inside config/initializers/.

Inside app_environment_variables.rb there's no need to distinguish environments as far as development or production because you will never check this file into your source code management system, hence it is for the development context by default. But if you need to set something special for the test environment (or for occasions when you test production mode locally), just add a conditional block below all the other variables:

if Rails.env.test?
  ENV['HTTP_USER'] = "testuser"
  ENV['HTTP_PASS'] = "testpass"
end

if Rails.env.production?
  ENV['HTTP_USER'] = "produser"
  ENV['HTTP_PASS'] = "prodpass"
end

------------------

gem install rubyzip

Zip::ZipFile::open("all.zip", true) {
   |zf|

   Dir['{test,lib}/**/*'].each { |f| zf.add(f, f) }

}

To unzip it to the file system again you'd do something like:

OUTDIR="out"

Zip::ZipFile::open("all.zip") {
   |zf|

   zf.each { |e|
     fpath = File.join(OUTDIR, e.name)
     FileUtils.mkdir_p(File.dirname(fpath))
     zf.extract(e, fpath)
   }
}